include/libnetlink.h

   1 #ifndef __LIBNETLINK_H__
   2 #define __LIBNETLINK_H__ 1
   3
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <asm/types.h>
   7 #include <linux/netlink.h>
   8 #include <linux/rtnetlink.h>
   9 #include <linux/if_link.h>
  10 #include <linux/if_addr.h>
  11 #include <linux/neighbour.h>
  12 #include <linux/netconf.h>
  13
  14 struct rtnl_handle
  15 {
  16         int                     fd;
  17         struct sockaddr_nl      local;
  18         struct sockaddr_nl      peer;
  19         __u32                   seq;
  20         __u32                   dump;
  21         int                     proto;
  22         FILE                   *dump_fp;
  23 #define RTNL_HANDLE_F_LISTEN_ALL_NSID           0x01
  24         int                     flags;
  25 };
  26
  27 extern int rcvbuf;
  28
  29 int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
  30         __attribute__((warn_unused_result));
  31
  32 int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
  33                              int protocol)
  34         __attribute__((warn_unused_result));
  35
  36 void rtnl_close(struct rtnl_handle *rth);
  37 int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
  38         __attribute__((warn_unused_result));
  39 int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
  40                                     __u32 filt_mask)
  41         __attribute__((warn_unused_result));
  42 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  43                              int len)
  44         __attribute__((warn_unused_result));
  45 int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
  46         __attribute__((warn_unused_result));
  47
  48 struct rtnl_ctrl_data {
  49         int     nsid;
  50 };
  51
  52 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  53                              struct nlmsghdr *n, void *);
  54
  55 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
  56                                     struct rtnl_ctrl_data *,
  57                                     struct nlmsghdr *n, void *);
  58
  59 struct rtnl_dump_filter_arg
  60 {
  61         rtnl_filter_t filter;
  62         void *arg1;
  63 };
  64
  65 int rtnl_dump_filter_l(struct rtnl_handle *rth,
  66                               const struct rtnl_dump_filter_arg *arg);
  67 int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter, void *arg);
  68 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  69               struct nlmsghdr *answer, size_t len)
  70         __attribute__((warn_unused_result));
  71 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  72         __attribute__((warn_unused_result));
  73 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
  74         __attribute__((warn_unused_result));
  75
  76 int addattr(struct nlmsghdr *n, int maxlen, int type);
  77 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  78 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  79 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  80 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  81 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  82
  83 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
  84               const void *data, int alen);
  85 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  86 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  87 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  88 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
  89                                    const void *data, int len);
  90 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  91 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
  92 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
  93 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  94 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
  95 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
  96                   const void *data, int alen);
  97
  98 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  99 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
 100                               int len, unsigned short flags);
 101 int parse_rtattr_byindex(struct rtattr *tb[], int max,
 102                          struct rtattr *rta, int len);
 103 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
 104 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 105
 106 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
 107 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
 108
 109 #define RTA_TAIL(rta) \
 110                 ((struct rtattr *) (((void *) (rta)) + \
 111                                     RTA_ALIGN((rta)->rta_len)))
 112
 113 #define parse_rtattr_nested(tb, max, rta) \
 114         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
 115
 116 #define parse_rtattr_one_nested(type, rta) \
 117         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
 118
 119 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
 120         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
 121                 __parse_rtattr_nested_compat(tb, max, rta, len); })
 122
 123 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
 124 {
 125         return *(__u8 *)RTA_DATA(rta);
 126 }
 127 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 128 {
 129         return *(__u16 *)RTA_DATA(rta);
 130 }
 131 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 132 {
 133         return *(__u32 *)RTA_DATA(rta);
 134 }
 135 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 136 {
 137         __u64 tmp;
 138         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 139         return tmp;
 140 }
 141 static inline const char *rta_getattr_str(const struct rtattr *rta)
 142 {
 143         return (const char *)RTA_DATA(rta);
 144 }
 145
 146 int rtnl_listen_all_nsid(struct rtnl_handle *);
 147 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
 148                 void *jarg);
 149 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
 150                    void *jarg);
 151
 152 #define NLMSG_TAIL(nmsg) \
 153         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 154
 155 #ifndef IFA_RTA
 156 #define IFA_RTA(r) \
 157         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 158 #endif
 159 #ifndef IFA_PAYLOAD
 160 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 161 #endif
 162
 163 #ifndef IFLA_RTA
 164 #define IFLA_RTA(r) \
 165         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 166 #endif
 167 #ifndef IFLA_PAYLOAD
 168 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 169 #endif
 170
 171 #ifndef NDA_RTA
 172 #define NDA_RTA(r) \
 173         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 174 #endif
 175 #ifndef NDA_PAYLOAD
 176 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 177 #endif
 178
 179 #ifndef NDTA_RTA
 180 #define NDTA_RTA(r) \
 181         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 182 #endif
 183 #ifndef NDTA_PAYLOAD
 184 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 185 #endif
 186
 187 #ifndef NETNS_RTA
 188 #define NETNS_RTA(r) \
 189         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 190 #endif
 191 #ifndef NETNS_PAYLOAD
 192 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n,sizeof(struct rtgenmsg))
 193 #endif
 194
 195 /* User defined nlmsg_type which is used mostly for logging netlink
 196  * messages from dump file */
 197 #define NLMSG_TSTAMP    15
 198
 199 #endif /* __LIBNETLINK_H__ */
 200